Compress Pdf in Ubuntu

reduce-pdf-size.sh

# Use the following ghostscript command:

gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook \
-dNOPAUSE -dQUIET -dBATCH -sOutputFile=/home/niketpathak/Downloads/output.pdf /home/niketpathak/Downloads/input.pdf

# Summary of -dPDFSETTINGS:
# -dPDFSETTINGS=/screen lower quality, smaller size. (72 dpi)
# -dPDFSETTINGS=/ebook for better quality, but slightly larger pdfs. (150 dpi)
# -dPDFSETTINGS=/prepress output similar to Acrobat Distiller "Prepress Optimized" setting (300 dpi)
# -dPDFSETTINGS=/printer selects output similar to the Acrobat Distiller "Print Optimized" setting (300 dpi)
# -dPDFSETTINGS=/default selects output intended to be useful across a wide variety of uses, possibly at the expense of a larger output file


# src: https://askubuntu.com/questions/113544/how-can-i-reduce-the-file-size-of-a-scanned-pdf-file